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The ring and the device-tree pool that backs it are now the size the factory firmware runs. Docs follow, and the hardware facts bank gains the reserved-memory map: 511 MiB usable, 96 MiB reserved for DMA, ~454 MiB left to Linux. image.health reads the pool size and ring_mb back and fails if they disagree, so a pool the parameter does not use cannot ship unnoticed, and checks that free never exceeds the ring less its gap.